Grinding and polishing machine.



W. LA HODNY.

GRINDING AND romsmm MACHINE.

APPLICATION FILED MAR 5, 1809. 944,678. Patented Dec.28,1909.

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Patented Dec; 28, 1909.

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W. LA 110mm GRINDING AND POLISHING MACHINE.

. APPLICATION FILED MAB. 5, 1909.

Patented Dec.28,1909.

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GRINDING AND POLISHINGMAGHINE.

APPLICATION FILED HA3 5, 1909.

944,678. Patented Dec.28,1909.

4 SHEETS-SHEET 4.

WILLIAM LA I-IODNY, OF BT'JFFA IZG, NEW YORK.

GRINDING AND POLISHING MACHINE.

Specification of Letters Patent.

Patented Dec. 28, 1909.

Application filed March 5, 1909. Serial No. 481,347.

To all whom it may concern.

Be it known that 1, WILLIAM LA HODNY, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented a new and useful Improvement in Grinding and PolishingMachines, of which the following is a specification.

This invention relates to machines for grinding and polishingplane'surfaces, and more particularly for polishing the beveled edges ofmirrors.

The primary object of the invention is to produce an efficient anddesirable machine of practical and economical construction which willrapidly produce a uniformly excellent polished surface, and which can bereadily and easily operated and adjusted.

Other objects of the invention are to provide the machine with meanswhereby the reciprocating polishing devices can be quickly set tooperate upon mirrors of different sizes and can also be readily adjustedangularly and laterally by the operator from time to time as may benecessary to cause them to properly bear on the surface being polished,or on different desired portions of the surface, so as to insure thebest results, without stopping the machine; also to mount the polishingdevices so that they can be thrown up away from the work table andsupported in the raised position to enable the work to be secured oradjusted on the table and removed; and also to improve glass-polishingmachines in the respects hereinafter described and set forth in theclaims.

The machine hereinafter described and.

shown in the drawings is designed primarily for polishing thebevelededges of mirrors, but it will be apparent from the following descriptionthat the machine is adapted too for grinding bevel. edges, and can alsobe used for grinding and polishing flat surfaces.

In the accompanying drawings, consisting of four sheets: Figure 1 is alongitudinal sectional elevation of a glass polishing machine embodyingthe invention, showing the polishing devices in operative position. Fig.2 is a side elevation partly in section thereof, showing a difierentposition of the parts. Fig. 3 is a sectional perspective view of thehinge joint of the guide rails for the polishing devices. Fig. 4 is aplan view, partly in horizontal section, thereof. Fig. 5 is a frontelevation, partly in section, thereof.

Fig. 6 is a longitudinal sectional elevation, on an enlarged scale, ofone of the polishing devices and its guide. Fig. 7 is a transversesectional elevation thereof, in line 77, Fig. 6. Fig. 8 is a fragmentarytransverse sectional elevation of the machine in line 88, Fig. 4.

Like letters of reference refer to like parts in the several figures.

A represents a stationary horizontal bed or table on which the glass orwork X is secured between suitable adjustable clamps a at its front andrear ends. The table may be of any suitable construction, being, in theconstruction illustrated, provided with legs a at its front end andsecured at its rear end to an upright main frame B on which the drivemechanism for the polishing devices is mounted.

C C represent two guide rails or bars for the reciprocating polishingdevices, which rails normally extend horizontally fore and aft of themachine above the table A and are supported by bearings D and D at thefront and rear ends of the table which are slidably mounted foradjusting the guide rails laterally or crosswise of the table. In theconstruction shown, the guide rails are square in cross section and areswiveled at their rear ends to curved guides cl which are hinged at d(see Fig. 1) to swing vertically on the rear bearings D, and the guiderails are provided at their front ends with cylindrical portions (Zadapted to rest loosely in open seats 03 in the front bearings D. Theguide rails are thus adapted to be turned axially to different positionsin their bearings D D and their front ends can be lifted out of theseats 03 and swung upwardly, as shown in Fig. 2. Handles (Z Figs. 1 and2, are preferably provided at the front ends of the guide rails forturning them, and set screws d Figs. 2 and 4:, are provided on the frontbearings D for securing the guide rods against turning in their bearingswhen they have been adjusted to the correct position. 7

The bearings D D for the guide rails are arranged to slide in transverseways 6 at the front and rear ends of the table in which they are adaptedto be adjusted by screws E E and E E at the front and rear endsrespectively of the table. These screws are journaled in bearings on thetable and pass through holes in the slide bearings, and the adjustingscrews E and E at opposite ends of the table have screw-threadedengagements with the bearings D D for one guide rail C and are connectedby a longitudinal shaft F journaled at one side of the table and bevelgears f f, Figs. l and 5, while the other screws E and E havescrewthreaded engagements with the bearings D. D for the other guiderail C, and are similarly connected by a longitudinal shaft and bevelgears, so that the front and rear screws for each guide rail will turntogether and produce corresponding adjustments of the opposite ends ofthe guide rail when one screw is turned, to keep the guide bars alwaysparallel with the edges of the work. One end of each of the frontadjusting screws is suitably fashioned to receive a crank handle forturning the screws. The guide rails could be differently mounted to turnaxially and swing vertically in suitable transversely movable bearings,and the bearings can be movably supported and adjusted transversely ofthe table in any other suitable way.

A polishing device is mounted to reciprocate on each guide rail C and G.Each polishing device, see Figs. 1, 6 and 7, preferably consists of twoweighted blocks G G which are pivoted to a yoke 9 so that they areallowed to tilt slightly. The blocks G G have longitudinal openings 9through which the guide rails pass and which are of a shape to permitthe blocks to rise and fall to accommodate themselves to the surfacebeing polished but to prevent lateral play of the blocks on the guiderails.

9 represents detachable shoes which are furnished with polishing padsand are removably fastened on the bottoms of the blocks G G by screws gin the ends of the blocksadapted to engage slotted lugs at the ends ofthe shoes. These shoes can be detached from the blocks by simplyloosening the screws 9 and pulling the shoes downwardly off of theblocks without removing the screws 9 so that one set of shoes suitablefor bevels of one width can be readily detached and replaced by anotherset of shoes suitable for bevels of a different width or for producingwork of a different character.

The polishing devices are joined by connecting links or rods H to aswinging lever or frame I which is hung on the upper portion of the mainframe B and is oscillated by suitable drive mechanism for reciprocatingthe polishing devices on the guide rails. The connecting rods H shownare provided with hinged front ends it, Figs. 6 and 7, which areslidably secured in curved slots in transverse arch-portions h of theyokes g of the polishing devices and are furnished with roller bearingsk whereby the connecting rods can slip freely in the yokes when theguide rails C C are turned axially to set the polishing devices at adesired angle.

The rear ends of the connecting rods H are secured to slide blocks i,Figs. 1 and 8, which are loosely hung on a horizontal cross-bar c" atthe lower .end of the swinging frame or lever I and in the oscillationsof this frame, slide back and forth between the spaced side pieces ofthe curved guides (Z to which the rear ends of the guide rails C G areswiveled. As these guides (Z are hinged to the rear bearings D for theguide rails, as before described, they normally hold the slide blocks 2'from sidewise movement on the cross-bar i, but move the slide blocksalong on the crossbar a" when the guide rails C C are adjusted laterallyor crosswise of the table.

The swinging frame or lever I is preferably oscillated by a crank wheelJ to which the frame is connected by a pitman A. The wrist pin Z of thecrank wheel adjustable radially on the wheel by a screw in a well knownmanner for regulating the throw of the frame or lever I. and the lengthof travel of the polishing devices G G. The crank wheel is secured to adrive shaft L which is journaled in hearings on the main frame B andprovided with a pulley Z for a drive belt. Any other suitable drivemechanism for the swinging frame or lever I could be employed.

M represents weights which are preferably employed for counterbalancingthe weight of the guide rails and polishing devices. The weights areslidably mounted on rods n secured to the curved guides (Z and normallyextending rearwardly at an upward inclination therefrom. \Vhen the frontends of the guide rails C C are lifted to raise the polishing devicesaway from the work, as shown in Fig. 2, the weights M slide rearwardlyon the rods m away from the hinges for the guide rails and hold therails up, and when the guide rails are again lowered to the horizontaloperative position the weights slide forwardly toward the hinges wheretheir weight is not sutlicient to lift the guide rails. m representscushioning springs on the rods m for the sliding weights.

If the machine should be stopped with the swinging frame I in itsforward position, as shown in Fig. 1, the frame I will prevent the guiderails from being swung up on their hinges (Z, and to avoid the necessityof turning the drive shaft L to retract the swinging frame, the guiderails C C are preferably formed between their ends with hinge joints n,which permit the front sections of the rails to be swung upwardly, asindicated by dotted lines in Fig. 1. Bolts N, Fig. 3, arranged to slidein dovetail grooves in the rail sections at the hinge joints n, areprovided for holding the joints stifl during the operation of themachine.

In the use of the machine the glass X is lli Secured in place on thetable A while the guide rails C C with the polishing devices G G areraised as shown in Fig. 2, and the guide rails are lowered until theirfront ends rest in the seats in the front bearings D. The guide railsare then moved laterally by the adjusting screws E E to place thepolishing devices over the opposite beveled edges of the glass and theguide rails are turned in their hearings to cause the polishing devicesG G to bear flat against the bevel edges and are secured by tighteningthe set screws (Z after which the drive mechanism is started toreciprocate the polishing devices. After the mechanism is started, if itis found that the polishing blocks G 3r do not bear flat on the bevelsurfaces, or do not properly cover the surfaces, they an be adjusted tothe proper position by turning the guide rails in their bearings andshifting them laterally, as explained. Owing to the described manner ofmounting the guide rails and connecting the polishing devices to theswinging frame these adjustments can be made without stopping thepolishing devices, which is a great advantage, as the operative can seeby the streaks made on the glass by the polishing devices when they arein proper position and can adjust the polishing devices from time totime as may be necessary to properly regulate the polishing.

The machine shown has two independently adjustable polishing deviceswhich operate simultaneously on the opposite parallel edges of theglass, but manifestly the construction permits of the use of a greateror less number of the polishing devices. When operating on smallglasses, or the narrow ends of glasses, two glasses can be secured onthe table, one in advance of the other, so that the front blocks G ofthe polishing devices will work on one glass and the other blocks on theother glass. The adjustable throw crank 7. permits the length of travelof the polishing devices to be regulated according to the length of theedges being operated upon.

When the machine is used for polishing, rouge and water are usuallypoured on the glass beneath the polishing devices, but the machine couldbe used for grinding by using a suitable abrasive material. As thepolishmg devices are connected directly to their driving mechanism andcan tilt somewhat on the guide rails, the pressure is thrown on thefront and rear ends of the devices as they travel respectively forwardlyand rearwardly, and this improves their action and makes them out muchfaster than machines where only the weight of the devices resting flaton the surface is relied upon. The machine constructed as described canalso be used for either polishing or grinding flat surfaces as thepolishing devlces can bet shifted to travel in different paths until theentire surface of the work is covered.

I claim as my invention:

1. The combination of a work table, a stationary guide over said table,a polishing device which is directed and confined laterally by saidguide but has vertical play on the guide whereby it is free to tilt;vertically relative to the guide, and means connected directly to saidpolishing device for reciproeating it on the guide, substantially as setforth.

2. The combination of a work table, a polishing device which isreciprocated above said table, and a guide for said polishing devicewhich is rotatably adjustable for regulating the angular position ofsaid polishing device, said guide being also adjustable laterally oversaid table, substantially as set forth.

3. The combination of a work table, a

polishing device which reciprocates above said. table, a guide for saidpolishing device which is rotatably adjustable for regulating theangular position of said polishing device and 1s ad ustable laterallyover sa1d table, drive mechanism for sa1d polishing device,

and loose connections between said polishing device and drive mechanismwhich permit said guide to be rota'tably and laterally adjusted whilethe drive mechanism is in operation, substantially as set forth.

4. The combination of a work table, a polishing device which isreciprocated above said table, and a guide for said polishing devicewhich is rotatably adjustable for regu lating the angular position ofsaid polishing device and is adjustable laterally over said table, saidguide being also mounted to swing upwardly away from said table,substantially as set forth.

5. The combination of a work table, a reciprocating polishing deviceabove said table, guide means for said polishing device which hold saiddevice in a fixed angular relation to the work but allow the devicevertical play to accommodate itself to the surface of the work, saidguide means being adjustable to change the angular relation of thepolishing device to the work, substan tially as set forth.

6. The combination of a work table, a reciprocating polishing device, aguide rail for said polishing device arranged h0rizontally above saidtable, movable bearings by which said rail is rotatably supported at itsopposite ends, said rail being hinged to one of said hearings to swingvertically, and means for adjusting said bearings laterally of saidtable, substantially as set forth.

7. The combination of a Work table, a horizontal guide rail above saidtable, a hearing at one end of said table to which said guide rail isconnected at one end to turn axially and swing vertically, a bearing atthe opposite end of said table in which the other end of said rail isremovably seated, means for securing the rail in said last mentionedbearing, meansfor adjusting said bearings laterally of said table, apolishing device guided by said guide rail, and means for reciprocatingsaid polishing device, substantially as set forth.

8. The combination of a work table, a polishing device whichreciprocates above said table, a guide for said polishing device whichis rotatably adjustable for regulating the angular position of saidpolishing device and is adjustable laterally over said table, areciprocating operating device for said polishing device, and meansconnecting said polishing device to said operating device and having asliding connection with said operating device and a loose connectionwith said polishing device to allow the rotary and lateral adjustmentsof said guide, substantially as set forth.

9. The combination of a work table, a polishing device, a guide railabove said table for said polishing device, means for adjusting saidguide rail laterally over the table, an oscillating frame forreciprocating said polishing device, a connecting rod at tached to saidpolishing device and having a sliding connection with said oscillatingframe, and a guide for said sliding connection connected to said guiderail whereby said connecting rod is moved with said guide rail when thelatter is adjusted, substantially as set forth.

10. The combination of a work table, a polishing device, a guide railabove said table for said polishing device, means for adjusting saidguide rail laterally over the table, a swinging frame having ahorizontal cross rod, a slide block on said cross rod, a rod connectingsaid slide block to said polishing device, a guide which is connected tosaid rail and is engaged by said slide block, and means for oscillatingsaid swinging frame, substantially as set forth.

11. The combination of a work table, a polishing device, a guide railabove said table for said polishing device, means for adjusting saidguide rail laterally over the table, a swinging frame having ahorizontal cross rod, a slide block on said cross rod, a rod connectingsaid slide block to said polishing device, a guide which is connected tosaid rail and is engaged by said slide block, and means for oscillatingsaid swinging frame which are adjustable to regulate the throw of saidframe, substantially as set forth.

12. The combination of a work table, a polishing device, a guide railfor said polishing device which is adjustable relative to the work andis pivoted at one end to swing upwardly, a weight which is movable on anextension of said guide rail toward and from the guide rail pivot forallowing the guide rail to remain in the operative position and forholding said guide rail in the raised position when lifted, and meansfor reciprocating said polishing device on said guide rail,substantially as set forth.

13, In a polishing machine, the combination of a reciprocating block, ashoe provided with a polishing pad and having end lugs with open slots,and screws in said block which engage said slotted lugs of the shoe fordetachably securing the shoe on said block, substantially as set forth.

Witness my hand, this 26th day of February, 1909.

ILLIAM LA HODNY. Witnesses C. W. PARKER, C. B. HORNBECK.

